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Lode Vaduh asked What kind of circuit can turn off a power source (by "opening" a circuit) after a given amount of time?
I have a motor powered by a battery (12V) and I was wondering if I could build a circuit to turn off the motor after a certain amount of time (for example, 2 minutes after the motor initiates). Is there anything that can help me do so?
And got the following answer:
Sure. Timers and relays will do it. You can substitute a power transistor for the relay. Basically you build a 555 one-shot that gets triggered when the power goes on, and runs for 2 minutes. The back edge of the one-shot sets a latch which drives a power transistor that had been keeping power to the motor. The latch has an RC on it that resets it on power up. In this mode it turns on power to the motor. After the 2 minutes, the back edge of the one shot causes the latch to set, which removes the power from the motor. Timer info: http://www.uoguelph.ca/~antoon/gadgets/555/555.html .